The invention discloses fabric stiffening adhesive paste, a preparation method thereof and forming cloth. The fabric stiffening adhesive paste comprises the following raw materials: vinyl acetate, organosilicone monomers containing unsaturated double bonds, butyl acrylate, polyvinyl alcohol, a silane coupling agent, a sodium salt chelating agent, a defoaming agent, deionized water, an initiator and a preservative. The finished fabric stiffening adhesive paste does not contain hazardous substances such as formaldehyde, heavy metal and the like, is free of toxicity and off-odor, is safe and reliable, has very strong adhesive force to multiple chemical fabrics, and is applicable to cotton cloth, chemical fabrics, linen, wool fabrics, silk and blended fabrics; the glossiness, hardness and hand feeling are improved without changing colored light of cloth, and the processed cloth does not easily absorb moisture and ease back and has storability.